Well, just to accompany you or someone to the load area? It depends on the attraction. Spaceship earth, and most epcot attractions, except probably test track, No. Space mountain, and Haunted mansion have "chicken-exits" where you can leave towards the end of the queue. Same with ToT.
Your best option is to call Disney - 1-407-W-Disney (why they don't get an 800 number, i have no clue). Also check your guidemaps and signs on the ride.
Ian